test(dashboard): add unit tests for dynamic form components

- Create comprehensive test suite for DynamicField (21 tests)
- Create comprehensive test suite for DynamicConfigForm (10 tests)
- Create comprehensive test suite for FieldHookRegistry (21 tests)
- Configure Vitest 4.0.18 with jsdom environment
- Add test setup with ResizeObserver and matchMedia polyfills
- 52 tests total covering all core functionality

dashboard/tsconfig.vitest.json

@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.app.json",
+  "compilerOptions": {
+    "types": ["vitest/globals", "@testing-library/jest-dom"]
+  },
+  "include": ["src"]
+}